According to Win7China (which is a credible source), Internet Explorer 10 (IE10) will include a major UI overhaul which is set to be more touch optimized than previous IE versions. Furthermore, company is stressing the importance of overall web browser performance as well.

As far as it is known now, those are the two main goals for Microsoft.

What is more interesting is Windows 8 UI. Win7China reports that changes between Windows 7 and Windows 8 will be far greater than everyone expected.

Pwn2Own, the yearly hacking contest held as part of the CanSecWest security conference, saw the successful hijacking of fully patched versions of Safari and Internet Explorer 8 this year. Ars Technica described Pwn2Own as the following:

If a researcher can pwn the browser—that is, make it run arbitrary code—then they get to own the hardware the browser runs on. This year, not only did they have to run arbitrary code, they also had to escape any sandboxes—restricted environments with reduced access to data and the operating system—that are imposed.